A team αποφοίτων του Πανεπιστημίου Carnegie Mellon in the US have developed a mechanism that can be integrated into shoes and turns them into chargers smartphones. 
The mechanism is called SolePower Insoles and according to its makers if placed on a pair of shoes the owner of them walking a total of one hour with them will be able to fully charge his device.
The kinetic energy of the legs is transferred to the mechanism by activating a mini generator η οποία φορτίζει μέσω ενός καλωδίου τη μπαταρία του τηλεφώνου. Σε πρώτη φάση ο μηχανισμός έχει αποδειχθεί functionalIt's built into sneakers, but the researchers say it could work in other types of shoes as well.
